• Title/Summary/Keyword: 소상파

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A Model Development for Swash Hydrodynamics Across the Shore (해안선 종단방향에서 소상파의 수동학적 거동 예측모형의 개발)

  • Hwang, Kyu-Nam;Cho, Yong-Sik
    • Journal of Korea Water Resources Association
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    • v.35 no.1
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    • pp.13-24
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    • 2002
  • In a physically realistic but simplified manner, an attempt is made in this study to develop a predictive model for swash hydrodynamics across the shore due to the storm waves on an arbitrary beach profile. Date from the SUPERTANK laboratory Data Collection Project are used for the model development, in which experiments were designed to simulate dune erosion under storm conditions at a prototype scale. The model predicts variations of swash height, velocity and period across the beach face in a swash zone. In general, the model proves to be capable of predicting variations of swash height, velocity and period across the shore. Quantitatively better predictions for the swash parameters could be achieved by improving the prediction of the beach face elevation, ymax, where the significant swash height becomes zero.

Experimental study for Hydraulic Characteristics as the Permeable underlayer width of Rubble Mound Structure (사석방파제 투수층 두께에 따른 사면상의 수리특성에 관한 실험연구)

  • 윤한삼;남인식;김종욱;류청로
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2001.05a
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    • pp.160-165
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    • 2001
  • In this study, the effects on hydraulic characteristics are discussed as the permeable underlayer width of the rubble mound structure changes. A series of hydraulic experiments were performed and wave run-up, reflection and set-up were investigated. Results indicated that wave run-down was affected by the water out from the permeable underlayer during down-rush. As the width increased, relative wave run-up decreased.

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Numerical Modeling of Wave Run-up and Internal Set-up on and in Permeable Coastal Structures (투과성 해안구조물의 소상파 및 내부수위변동에 관한 수치모델링)

  • 남인식;김종욱;류청로
    • Journal of Ocean Engineering and Technology
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    • v.16 no.5
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    • pp.34-40
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    • 2002
  • A numerical model has been developed for the permeable coastal structures to simulate hydraulic characteristics on the permeable slopes, which interact with internal four field the structures. The model includes hydraulics in the porous medium. Numerical model was calibrated using hydraulic model experiments performed in 2-D wave flume in the Institute of Ocean Hydraulics in PKNU. Better aggrements were obtained with the model which employed inertia resistance term than with the conventional model, PBREAK.

Analysis of Hydraulic Characteristic in Surf Zone using the SWASH Model during Typhoon NAKRI(1412) in Haeundae Beach (SWASH 모형을 이용한 태풍 나크리(NAKRI)에 의한 해운대 해수욕장의 쇄파대 수리특성 해석)

  • Lee, Jong-Sup;Park, Myeong-Won;Kang, Min-Ho;Kang, Tae-Soon
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.21 no.5
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    • pp.591-598
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    • 2015
  • A hydraulic characteristics in the surf zone such as wave breaking points, wave set-down, wave set-up, wave-induced currents and run-up heights are studied using the SWASH model during Typhoon NAKRI(1412) in Haeundae Beach. Incident wave conditions is obtained from one-hourly observed wave data by KHOA and irregular wave by JONSWAP spectrum is given as an open boundary condition in the model. A Wave-induced current patterns by the SWASH model is compared with the observed currents and sediment flux patterns in that areas, the calculated maximum wave run-up heights in the model is compared with the video monitoring data, the empirical formula by Stockdon et al. and Mase. A dominant longshore currents toward the east of the beach appears due to the effect of incident wave direction and the geographical features and some rip currents occurs at the central part of the beach. The maximum wave run-up height(1.15 m) by the SWASH model shows a similar pattern with the video monitoring data(1.26 m) and the magnitude shows a similar result(1.33m) by Stockdon et al.

Numerical modeling of wave run-up and internal setup on and in permeable coastal structures (투과성해안구조물의 소상파 및 내부수위변동에 관한 수치모델링)

  • 남인식;윤한삼;김종욱;류청로
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2001.05a
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    • pp.172-179
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    • 2001
  • A numelical model has been developed for the permeable coastal structures to simulate hydraulic characteristics on the permeable slopes, which interact with internal flow field of the structures. The model includes hydraulics in the porous medium. Numerical model was calibrated using hydraulic model experiments performed in 2-D wave flume in the Institute of Orean Hydraulics in PKNU. Good agreement were obtained with the model which employed inertia resistance term than with the conventional model, PBREAK.

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Experimental Study for Hydraulic Characteristics as the Permeable Underlayer Thickness of Rubble mound Structure (사석방파제 투수하부층 두께에 따른 사면상의 수리특성 실험연구)

  • 윤한삼;김종욱;류청로
    • Journal of Ocean Engineering and Technology
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    • v.16 no.3
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    • pp.40-45
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    • 2002
  • In this study, the effects on hydraulic characteristics are discussed as the permeable underlayer thickness of the rubble mound structure changes. A series of hydraulic experiments were performed and wave run-up, reflection and set-up were investigated. Result indicated that wave run-down was affected by the water out from the permeable underlayer during down-rush. As the thickness increased, relative wave run-up decreased.

A Study on Hydraulic Characteristics of rollway of Ice-Harbor Type Fishway Using Computational Fluid Dynamics (전산유체역학을 이용한 아이스하버식 어도 내 월류부의 흐름특성에 관한 연구)

  • Go, Seon-Ho
    • Proceeding of EDISON Challenge
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    • 2015.03a
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    • pp.618-622
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    • 2015
  • 어도(fishway)란 강이 댐과 같은 인공물로 막혀있을 때 물고기가 지나갈 수 있도록 만든 통로이다. 본 연구에서는 전산유체해석 프로그램인 EDISON_CFD 시스템을 활용하여 아이스하버식 어도 내 월류부(rollway)에서 유체의 수직흐름특성을 분석하였다. 어류는 소상과 강하시 어도 내의 흐름에 민감하므로, 흐름에 영향을 주는 요인을 분석하는 것은 중요한 문제이다 어도는 2차원으로 간략화하여 모델링하였으며, 강의 유속, 어도의 기울기, 월류부 높이를 변화시키며 이들이 어도 내의 흐름특성과 어떤 관계가 있는지 분석하였다. 또 속도 증가에 따른 수면파의 파장 변화를 프로우드수와 연관지어 설명하였고, 레이놀즈수가 어도 내의 흐름특성과 밀접한 관련이 있음을 확인하였으며 기 설치된 어도의 문제점을 보완할 수 있는 방법을 제시하였다.

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Variation Characteristics of the Groundwater Level of Natural Vegetation and Sandy Beaches (식생/모래기반 자연해빈에서의 지하수위 변동특성)

  • Park, JungHyun;Yoon, Han-sam
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.19 no.1
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    • pp.62-73
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    • 2016
  • The variation of groundwater by wave, tide and precipitation conditions is closely related to the vegetation environment at the natural vegetation and sandy based beach, and it has a significant impact on the vegetation development and ground stabilization. In this study, the water temperature, electrical conductivity, and pressure were monitored at five observational stations normal to the Jinu-do(Island) shoreline of Nakdong river estuary from March 2012 to September 2014 (approximately 799 days) with the aim of measuring the variation in groundwater-table characteristics. The purpose of the study was to identify factors (tide, wave etc.) affecting groundwater-table variation using time series and correlation analysis, and to record spatial variations in the groundwater level and electrical conductivity as a result of storm events. The observational station in the intertidal zone was strongly affected by wave period and tide level. During the storm period, the groundwater-table and electrical conductivity were stabilized at the edge of sand dunes, vegetation, and areas of transition between freshwater and seawater.

An Experimental Study of Sediment Transport Patterns behind Offshore Structure (외해 구조물 배후의 표사이동에 관한 실험적 연구)

  • Shin Seung-Ho;Hong Keyyong
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.7 no.4
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    • pp.207-215
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    • 2004
  • Recently, securing a vast land in the land region becomes more difficult and efforts to seek its alternation in the sea area have been increased. As a consequence, the coastal region has been faced to extensive beach erosion problems. In planning offshore structures such as artificial islands, it is necessary to forecast the influence of the structure construction exerting on the beach erosion of the adjacent coast. In the present study, the sediment movement pattern behind offshore structure was examined through a series of three dimensional movable bed experiments, so as to develop the numerical model which forecasts morphological change including beach erosions. The experimental results reveal that the sediment movement patterns of the beach line side and the depth region are separated at a certain boundary line. In details, at the beach side including swash zone the sediment movement becomes dominant, which is governed by a relation between depth contours and incident wave directions, while at the depth region the bed load and suspended load due to the orbit motion of waves are carried by nearshore currents, and both movements are clearly separated at a specified boundary that is related to partial standing wave from the beach. It is expected that these results can be effectively used for verification of a numerical model on morphological change of the coast.

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Interaction between Coastal Debris and Vegetation Zone Line at a Natural Beach (자연 해안표착물과 배후 식생대 전선의 상호 작용에 관한 연구)

  • Yoon, Han Sam;Yoo, Chang Ill
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.17 no.3
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    • pp.224-235
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    • 2014
  • Changes in the interactions among incident ocean water waves, coastal debris (marine debris), and the back vegetation zone line on a natural sandy beach on the island of Jinu-do in the Nakdong river estuary were investigated. The study involved a cross-sectional field survey of the beach, numerical modeling of incident ocean water waves, field observations of the distribution of coastal debris, and vegetation zone line tracking using GPS. The conclusions of this study can be summarized as follows: (1) The ground level of the swash zone (sandy beach) on Jinu-do is rising, and the vegetation zone line, which is the boundary of the coastal sand dunes, shows a tendency to move forward toward the open sea. The vegetation zone line is developing particularly strongly in the offshore direction in areas where the ground level is elevated by more than 1.5 m. (2) The spatial distributions of incident waves differed due to variations in the water depth at the front of the beach, and the wave run-up in the swash zone also displayed complex spatial variations. With a large wave run-up, coastal debris may reach the vegetation zone line, but if the run-up is smaller, coastal debris is more likely to deposit in the form of an independent island on the beach. The deposited coastal debris can then become a factor determining which vegetation zone line advances or retreats. Finally, based on the results of this investigation, a schematic concept of the mechanisms of interaction between the coastal debris and the coastal vegetation zone line due to wave action was derived.